Chain hoist.



35 prises a frame 14 of UNITED-STATES, PATENT OFFICE. 7

- HARRY JOSEPH BUR, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO ELLSWORTH L.

WARD, HARRY JOSEPH BUR, AND RUDOLPH 'PANY, OF PHILADELPHIA,

PENNSYLVANIA.

H. BECK, TRADING AS CLIMAX HOIST COM- GHAIN HOIST.

To all whom it may concern:

Be it known that I, HARRY JOSEPH BUR, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Chain Hoists, of which the following is a specification. I

This invention relates to hoisting a paratus, and has special reference to that class of hoists which are operated usually by hand power and are employed for lifting heavy articles in warehouses, storage rooms, or the like, and includes novel devices hereinafter specified and claimed.

- For a full understanding of the invention,

including its construction and characteristic advantages, reference is tobe had to thefollowing detail description and to the accompanying drawings, in which,

Figure 1 is a side elevation of the apparatus; Fig. 2 is'a front elevation of the same; Fig. 3 is a vertical sectional view; Fig. 4'is a partial section taken on the line 4 4 of Fig. 3, andFig. 5 is a similar view-taken on the line 55 of Fig. 3.. Throughout this description and on the several views of the draw1ngs,similar parts to the are referred to by like reference characters.

This invention in its preferred embodiment comprises a supporting trolley 10, supported upon and movable along an I-beam 11. Suspended from said trolley 10 by any suitable means such as a hook 12' is the main portion of the hoist 13. Said hoist comany suitable construction and material. A load wheel 15 is situated substantially in the center of said frame and is secured-rigidly, and by a key, to a meinber 16 comprising a hollow arbor and an end gear 17 inte ral therewith. The said member 16 is j ournaled for rotation in the frame 14 preferably by antifriction bearings. Meshing with the gear 17 is a pinion 18 ,secured to or integral with an internal ear 19 andjournaled for rotation on-a stu 7 main frame of the h'oist. The car .19 inter-. meshes with a pinion 21 secure toacentral shaft 22 operating .within the; member 16 aforesaid. The end of the'shaft 22 -opposite pinion,21 has keyed to extending'flange 24, the other end of the I Specification of Letters Patent. 4 Application filed February 24, 1908. Serial No. 417,803.

ternally and j ournaled loosely on t 'ber 23 is a' ratchet hoist is as follows:

20 secured totheit -a clutchmember 23, having at one end an-outwardly Patented July 7, 1908.

said clutch member being exteriorly screw. threaded at 25". Mounted upon the threaded end of said clutch member is a wheel 26 designed to be operated by any suitable means as by a hand chain 27. The wheel 26'is inscrew threaded for direct cooperation with the threaded portion of the mem- .ber 23 when rotated. Between the inner face of the hand-wheel 26 and the outer face of the flange 24 are interposed a plurality of friction disks 28, and cod erating therewith lib hub of the memwheel 29 adapted to be held from backward rotation by a pawl 30. Thus far described the operation of the Power being applied to rotate the handle wheel, say toward the right or clockwise, the first effect will be for said wheel to tighten up the disks 28 causing the ratchet wheel 29 and the member 23 to become sufficiently secured together for the wheel to cause rotation of t e shaft 22, and a continued rotation of the s aft 22, through the pinions and gears above described, will cause rotation of the load wheel 15, thereby hoisting the load. U on release of the power from the hand w eel the load will be automatically held sus ended at the point to which it has been el evated. This result isjdue to theimmediate automatic effect of the pawl 30 in cooperation with the ratchet wheel 29 which is securely clutched to the member 23. In order to lower the load a slight reverse movement of the-hand wheel is sufiicient to allow the clutch members to slip with respect to the ratchetwheel 29,

whereby the oad will be run down due to its own weight. The speed, however, at which the load will descend will be determined by the amount of movement of the hand wheel in the reverse direction, it being impossiblefor the load to descend more ra id y will be permitted by said hand w eel.

The trolley 10 may e irectly connected. Said yoke is than ch thehook 12 is orto which reference has here tofore been made comlplrises a substantially U-sha ed oke 31 to connected on each side of theI-beam 11 to the central portion of aside plate 32, such connection being a pivotal one. Each of the side plates 32 has journaled thereto a plurality of trolle wheels 33, one at each end. The engaging ace of each of the wheels 33 is clutch having a screw thread, a hand wheel great dea 'is claimed as new, is:

preferably spherical, in order to reduce the amount of frictional contact between it and the supporting flange of the I-beam. From this construction of the trolley it willbe apparent that the load carried thereby Wlll always be equally distributed among all four of the supporting wheels, a matter of a of importance from a practical standpoint.

Havingthus described the invention, what 1. The hereindescribed hoisting a paratus comprising a frame, a hollow mem er journaled in said frame and having an internal gear integral therewith, a pinion in mesh with said internal gear, a second internal gear secured to said pinion, a second pinion in mesh with the second internal gear, a shaft to which the latter pinion is secured and journaled for rotation within said hollow member, a clutch secured to said shaft, the

having an interior screw thread cooperating with said clutch member to cause rotation of 1 said shaft, and a load wheel secured to said hollow member.

2. A hoist comprising, in combination, a

frame, a hollow member antifrictionally journaled therein, an internal gear integral with one end of said hollow member, a shaft journaled within said hollow member, a pinion secured to one end of said shaft, intermeshing gears between said internal gear and said pinion, a clutch member keyed to the op )0- site end of said shaft, said clutch member eing exteriorly screw threaded and provided with an outwardly projecting flange, a hand wheel screw threaded upon said clutch member, friction disks between the hand wheel and said flange, a ratchet wheel loosely mounted between said friction disk, and a pawl cooperating with said ratchet wheel.

In testimony whereof I affix my signature in presence of two Witnesses.

HARRY JOSEPH BUR.

Witnesses:

ELLSWORTH L. WARD, M. VAN BoosKrRK. 

